A high pressure variable displacement plunger pump

Abstract

The invention discloses a high-pressure variable plunger pump. The high-pressure variable plunger pump comprises a pump body and a pump shell arranged on the right end face of the pump body. An oil inlet cavity is formed between the pump shell and the right end face of the pump body, and an oil inlet hole is formed in the left end face of the pump body. The right end face of the pump body is rotationally connected with a rotation shaft, a plurality of plunger modules are arranged in the oil inlet cavity at equal intervals, the part, in the oil inlet cavity, of the rotation shaft is eccentrically provided with a shaft sleeve, and the shaft sleeve is provided with a multi-edge shaft sleeve. A second oil outlet hole is formed in the center position of the left end face of the pump body, a third oil outlet hole is formed in the pump body in the radial direction of the second oil outlet hole, and a plurality of fourth oil outlet holes are formed in the pump body. The communicating positionsof the third oil outlet hole and the fourth oil outlet holes in the pump body are provided with oil outlet one-way valve assemblies. The pump body is internally provided with a variable control valveassembly for controlling the flow of the second oil outlet hole. The high-pressure variable plunger pump is compact in size, low in cost and capable of being applied to the high pressure.

Description

technical field [0001] The invention relates to the technical field of plunger pumps, in particular to a high-pressure variable displacement plunger pump. Background technique [0002] The plunger pump is a hydraulic power component widely used in the hydraulic system. In most working conditions of the existing mechanical equipment, the plunger pump has the requirements of low pressure and large flow, high pressure and small flow. There are two solutions in the prior art. The first One is to use two plunger pumps, one large and one small, which are respectively driven by two motors, one large and one small. When the pressure of the hydraulic system reaches a certain pressure value, the large motor is turned off through the electronic control program so that the large pump is not working. , this kind of scheme needs to be equipped with two motors, which occupies a large area and has a large installed power, which increases the cost of use; the second scheme is to use double p...

AI Technical Summary

Problems solved by technology

[0002] The plunger pump is a hydraulic power component widely used in the hydraulic system. In most working conditions of the existing mechanical equipment, the plunger pump has the requirements of low pressure and large flow, high pressure and small flow. There are two solutions in the prior art. The first One is to use two plunger pumps, one large and one small, which are respectively driven by two motors, one large and one small. When the pressure of the hydraulic system reaches a certain pressure value, the large motor is turned off through the electronic control program so that the large pump is not working. , this kind of scheme needs to be equipped with two motors, which occupies a large area and has a large installed power, which increases the cost of use; the second scheme is to use double pumps and double pump confluence unloading valves, and the double pumps are driven by one motor , when the pressure of the hydraulic system reaches a certain pressure value, the double-pump confluence unloading valve is controlled by the electronic control program to unload the large-displacement pump outlet in the double-connected pump. Due to the high price of the double-connected pump, this kind of scheme The double-pump confluence unloading valve is large in size and high in cost, which also increases the cost of use

In addition, the above two solutions are only suitable for medium and low pressure hydraulic systems, that is, the pressure is lower than 35MPa. For hydraulic systems with system pressure greater than 35MPa, there is no good solution in the prior art

Images